Overflow Box 700GPH, 3.25"W x 3.75"D x 5"AO Overflows can help turn your reef aquarium into a high performance aquatic environment that will make your coral (particularly your SPS) thrive. Highly effective, the overflow box increases the rate at which surface water is pulled into the filter, reduces surface film and dust by removing water from the area of the aquarium where most organic waste is found.Whether you need to skim water for your sump, your closed head circulation, or external fed powerheads, you should use an overflow box to help protect your inhabitants and provide control over the amount of water leaving your tank.

Overflow Box 700GPH, 3.25"W x 3.75"D x 5".

3 ¼”W x 3”D x 5”T

Works great with 10-55 gallon aquariums

Made from ¼” Black Cast Acrylic

4-Sided (Front, 2 Sides, and Bottom)

All joints are water tight.

Recommended Return Pump of 700 gph or less.

Easy Installation Using Our 100% Silicone Adhesive.

* Aquarium needs to be drilled with proper size hole/bulkhead to utilize this overflow box.

This is a great product and I'm so happy to see AquaCave carrying this line of overflows. I bought the 700 GPH overflow for my 29g nano and it can handle all the flow I will ever need. Blends perfect with the black wall of the nano and very easy to install. I used silicone and my tank was ready to go 24 hours later. (Posted on 7/8/2013)

GREAT OVERFLOW! Review by Nick

Will buy again. I finally found an overflow for my 40g frag tank. Takes up little space and installed in 10 minutes. Planning to buy a larger one for my DT. (Posted on 1/28/2013)

PERFECT FOR NANO Review by John

I bought this for my 20 gallon nano tank. Perfect size and great option for tanks with tempered glass bottoms. Thanks AquaCave! (Posted on 1/28/2013)

VERY FUNCTIONAL! Review by Matt

I ordered this for my frag tank. Great little overflow. Nothing fancy but well made and durable. Will stand the test of time. (Posted on 1/28/2013)

PERFECT PERFECT PERFECT!!! Review by John

This overflow is all about durability and functionality! Its simple, space-saving and made from thick, strong acrylic. Not flimsy thin plastic. I tend to rearrange the rock in my tank and hit the overflow pretty hard with a large piece of rock. There wasnt even a mark left let alone and serious cracks or damage. Very tough! A must have for any serious aquarist! (Posted on 1/1/2013)

This is a great product and I'm so happy to see AquaCave carrying this line of overflows. I bought the 700 GPH overflow for my 29g nano and it can handle all the flow I will ever need. Blends perfect with the black wall of the nano and very easy to install. I used silicone and my tank was ready to go 24 hours later. (Posted on 7/8/2013)

This overflow is all about durability and functionality! Its simple, space-saving and made from thick, strong acrylic. Not flimsy thin plastic. I tend to rearrange the rock in my tank and hit the overflow pretty hard with a large piece of rock. There wasnt even a mark left let alone and serious cracks or damage. Very tough! A must have for any serious aquarist! (Posted on 1/1/2013)